Electrodepositable coating composition
a coating composition and electrode technology, applied in coatings, transportation and packaging, cosmonautic vehicles, etc., can solve the problems of unstable cured film, film resulting from hydroxyl functional phosphated epoxy resin not retaining film integrity,
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example 1
on of an Aqueous Resinous Dispersion of a Hydroxyl-Functional Phosphated Epoxy Resin
[0140]Example 1A: A general procedure for making an aqueous resinous dispersion of a hydroxyl-functional phosphated epoxy resin was performed as follows:
Charge #MaterialAmount (g)1Bisphenol-A Diglycidyl Ether141.42Bisphenol-A45.53Butyl CELLOSOLVE114.142-Ethyl-1-hexanol21.25Ethyltriphenylphosphonium Bromide0.16Ektasolve EEH220.5785% Phosphoric Acid5.58Phenylphosphonic Acid3.39Ektasolve EEH0.910Deionized water9.611Diisopropanolamine15.612Cymel 1130370.213Deionized water138.114Deionized water247.812-Butoxyethanol available from Dow Chemical Company2Ethylene glycol 2-ethylhexyl ether available from Eastman Chemical Company3Cymel 1130 a methylated / n-butylated melamine-formaldehyde crosslinker available from Allnex (98% ± 2% non-volatile content)
[0141]Charges 1-5 were added to a flask set up for total reflux with stirring under nitrogen and heated to 130° C. and allowed to exotherm to 160° C. The mixture w...
example 2
on of a Carbamate-Functional Oligomer
[0148]A reaction schematic and general procedure for making a carbamate-functional oligomer (hydroxypropylcarbamate fully-capped hexamethylene diisocyanate trimer) was performed as follows:
Charge #MaterialAmount (g)1Hexamethylene Diisocyanate Trimer1970.02Methyl isobutyl ketone362.43Dibutyltindilaurate1.64Carbalink HPC (95% solids)2639.41Available as Desmodur N 3300 from Covestro2Hydroxypropylcarbamate commercially available from Huntsman
[0149]Charges 1-3 were added to a flask set up for total reflux with stirring under nitrogen. The mixture was heated to a temperature of 60° C. Charge 4 was added over 2 hours through an addition funnel while the resulting exotherm was maintained under 60° C. After 2 hours, the mixture revealed no residual isocyanate peak by IR (2200-2300 cm−1). The mixture was then cooled to 40° C. and poured out. Final solids were 84.2%. Final molecular weight as determined by GPC (Mz) was 2,999.
example 3
on of an Aqueous Resinous Dispersion of a Hydroxyl-Functional Phosphated Epoxy Resin and Carbamate-Functional Oligomer
[0150]Example 3A: A general procedure for making an aqueous resinous dispersion of a hydroxyl-functional phosphated epoxy resin and the carbamate-functional oligomer of Example 2 was performed as follows:
Charge #MaterialAmount (g)1Bisphenol-A Diglycidyl Ether184.42Bisphenol-A59.43Butyl carbitol formal7.54Ethyltriphenylphosphonium Bromide0.25Methyl isobutyl ketone19.56Ektasolve EEH41.47Butyl CELLOSOLVE37.382-Ethyl-1-hexanol49.7985% Phosphoric Acid14.610Phenylphosphonic Acid12.711Ektasolve EEH4.112Deionized water31.013Diisopropanolamine49.614Cymel 1130106.215Carbamate functional oligomer of Example 2336.316Deionized water358.617Deionized water532.4
[0151]Charges 1-4 were added to a flask set up for total reflux with stirring under nitrogen and heated to 130° C. and allowed to exotherm to 160° C. The mixture was held at 160° C. for 1 hour. After 1 hour, charge 5 was adde...
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